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No. 6l0,|57.

Patented Aug;.. 30, I898. M. T. CAMPBELL.

BICYCLE (Application filed Dec. 21, 1896.)

(No Model.)

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tlrrnn MILTON T. CAMPBELL, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE-l-IALF TO WILLIAM H. THOMAS, OF SAME PLACE.

BICYCLE.

SPECIFICATION forming part of Letters Patent No. 610,157, dated August30, 1898.

Application filed December 21, 1896. Serial No. 616,398. (No model.)

To all whom it may concern:

Be it known that I, MILTON T. CAMPBELL, a citizen of the United States,residing at Indianapolis, in the county of Marion and State of Indiana,have invented certain new and useful Improvements in Bicycles, of whichthe following is a specification.

My present invention relates to bicycles and such like vehicles andpertains to the means of driving and controlling the driven wheel. Saidinvention will be first fully described, and the novel features thereofthen pointed out in the claims.

Referring to the accompanying drawings, which are made a part hereof,and on which 7 similar letters of reference indicate similar parts,Figure l is a side elevation of a bicycle crank-shaft; C C, the twoparts of the crankarms; D, the pitman, and E the hub of the drivenwheel.

The frame A, the wheels A and A and the crank-shaft B are in mostparticulars of any ordinary or desired construction.

The crank-arms are, however, each composed of two parts C and C, whichare adjustable upon each other, so that the length of the stroke may bevaried as desired. As shown in Figs. 2, 3, and 4, that crank-arm towhich the pitman D is connected is not only composed of two parts, butthese are united by an intervening structure C to which the forward endof the pitman D is connected. The sides of said structure fit againstthe crank-arm parts and are secured thereon at any point desired by abolt 0 As will be readily understood, the adjustment may be on either orboth the parts of the crank-arm, as each part is provided with severalboltholes, and thus in making such adjustment the relative positions ofthe pitman and the crank-shaft may be either varied or maintained. Eachcrank-arm has a pedal 0* upon the outer end, as is usual.

The pitman D, I prefer to make, as shown, a combined double rack-bar andpitman. The double internally-toothed rack-bar end engages withgear-rings (not shown) which are suitably mounted upon one end of thehub E, and the other end of said pitman is, as before stated, connectedby means of the structure C and bolt 0 to the crank-arm.

The hub E bears suitable gears, with which the pitman engages, upon oneend. (Not shown.)

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. The combination, in a bicycle, of the driven wheel, a pitmanconnected to the hub of said driven wheel and running thence to an armon the crank-shaft, said crank-shaft, and said arm, said pitman and saidarm being adj ustably connected together at a'point inter- In witnesswhereof I have hereunto set my hand and seal, at Indianapolis, Indiana,this 16th day of December, A. D. 1896.

MILTON T. CAMPBELL. [L.

Witnesses:

JACOB D. A. HAss, JAMES A. WALSH.

